Issue #2349711 by lauriii, mortendk, sqndr, akalata, yannickoo, Manjit.Singh, Jolidog, b0unty, aliyakhan, LewisNyman: Remove all visual from stark

Issue #1912610 by amitgoyal, BryanCGreen24, lokapujya, Rajendar Reddy, echoz, barraponto, LewisNyman, pixelwhip: Rename layout classes to follow the layout style naming convention.

Issue #2117441 by alanburke: Fixed Stark layout broken as 'generic' classes removed from html.tpl.php.

Issue #2011578 by mortendk, tlattimore, Cottser, soulston: Markup for Stark's page.html.twig + maintenance-page.html.twig.

Issue #2015789 by fubhy, echoz, rteijeiro, LewisNyman, penyaskito: Remove language_css_alter() (RTL stylesheets) in favor of HTML 'dir' attribute.

Issue #1276908 by jessebeach, nod_, moshe weitzman, lewisnyman, webchick: Fixed Administrative tables are too wide for smaller screens.

- Patch #1322794 by JohnAlbin, alanburke, jrbeeman, rupl, Tor Arne Thune: make Stark use a responsive layout.